托管在Windows服务C＃WCF 5分钟后进入闲置状态 [英] c# wcf hosted in windows service goes idle after 5 minutes

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本文介绍了托管在Windows服务C＃WCF 5分钟后进入闲置状态的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我里面有一个Windows服务托管的WCF服务。 （所以它不是托管在IIS中，它是selfhosted）

中的应用使得有可能通过HTTP接收的测量。这些都是当前正在写入到一个txt文件。

我也有一个任务配置，在特定时间运行的每一天。

我的问题是，当我不通过HTTP接收测量ATLEAST 5分钟服务似乎进入空闲状态。

我注意到，5分钟后需要30秒的服务响应。如果我发送测量通过http 30秒后​​，我得到一个快速的反应。

这可能是什么问题？

的app.config 

 ＆LT; XML版本=1.0＆GT？;
＆lt;结构＆GT;
  ＆LT; configSections＆GT;
    ＆LT;！ - 有关实​​体框架配置的详细信息，请访问http://go.microsoft.com/fwlink/?LinkID=237468  - ＆GT;
    ＆lt;节名称=的EntityFrameworkTYPE =System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection，的EntityFramework，版本= 6.0.0.0，文化=中性公钥= b77a5c561934e089requirePermission =FALSE/＆GT;
    ＆LT; sectionGroup名=的applicationSettingsTYPE =System.Configuration.ApplicationSettingsGroup，系统，版本= 4.0.0.0，文化=中性公钥= b77a5c561934e089＆GT;
      ＆lt;节名称=Applicatie.Properties.SettingsTYPE =System.Configuration.ClientSettingsSection，系统，版本= 4.0.0.0，文化=中性公钥= b77a5c561934e089requirePermission =FALSE/＆GT;
    ＆LT; / sectionGroup＆GT;
  ＆LT; / configSections＆GT;
  ＆LT;的ConnectionStrings＆GT;

  ＆LT; /的ConnectionStrings＆GT;
  ＆LT; system.serviceModel＆GT;

    ＆LT;绑定＆GT;

      ＆LT;的WebHttpBinding＆GT;
        ＆LT;绑定名称=LargeWebmaxBufferSize =1500000maxBufferPoolSize =1500000
          maxReceivedMessageSize =20亿transferMode =流媒体＆GT;
          ＆LT; readerQuotas MAXDEPTH =32maxStringContentLength =656000maxArrayLength =656000
            maxBytesPerRead =656000maxNameTableCharCount =656000/＆GT;
        ＆LT; /装订＆GT;
      ＆LT; /的WebHttpBinding＆GT;
    ＆LT; /绑定＆GT;
    ＆LT;服务＆GT;
      ＆LT;服务名称=Applicatie.ApplicatiebehaviorConfiguration =代理＆GT;
        ＆LT;主机＆GT;
          ＆LT; baseAddresses＆GT;
            ＆LT;新增baseAddress =HTTP：//本地主机：5001 / Applicatie/＆GT;
          ＆LT; / baseAddresses＆GT;
        ＆LT; /主机＆GT;
        ＆LT;端点地址=绑定=的WebHttpBindingbindingConfiguration =LargeWebbehaviorConfiguration =webBehavior合同=Applicatie.IApplicatie/＆GT;
      ＆LT; /服务＆GT;
    ＆LT; /服务＆GT;
    ＆LT;行为＆GT;
      ＆LT; endpointBehaviors＆GT;
        ＆LT;行为NAME =webBehavior＆GT;
          ＆LT; webHttp /＆GT;
          ＆LT; CorsSupport /＆GT;
        ＆LT; /行为＆GT;
      ＆LT; / endpointBehaviors＆GT;
      ＆LT; serviceBehaviors＆GT;
        ＆LT;行为NAME =代理＆GT;
          ＆LT; serviceMetadata httpGetEnabled =真httpsGetEnabled =真/＆GT;
          ＆LT; serviceDebug httpHelpPageEnabled =真includeExceptionDetailInFaults =真/＆GT;
        ＆LT; /行为＆GT;
      ＆LT; / serviceBehaviors＆GT;
    ＆LT; /行为＆GT;
    ＆LT;扩展＆GT;
      ＆LT; behaviorExtensions＆GT;
        ＆LT;添加名称=CorsSupportTYPE =WebHttpCors.CorsSupportBehaviorElement，WebHttpCors，版本= 2.0.0.0，文化=中性公钥=空/＆GT;
      ＆LT; / behaviorExtensions＆GT;
    ＆LT; /扩展＆GT;
  ＆LT; /system.serviceModel>
  ＆LT;启动＆GT;
    ＆LT; supportedRuntime版本=4.0版的SKU =NETFramework，版本= V4.5/＆GT;
  ＆LT; /启动＆GT;


  ＆LT;运行＆GT;
    ＆LT; assemblyBinding的xmlns =瓮：架构 - 微软COM：asm.v1＆GT;
      ＆LT; dependentAssembly＆GT;
        ＆LT; assemblyIdentity名=的EntityFramework公钥=b77a5c561934e089文化=中性/＆GT;
        ＆LT; bindingRedirect oldVersion =0.0.0.0-5.0.0.0NEWVERSION =5.0.0.0/＆GT;
      ＆LT; / dependentAssembly＆GT;
    ＆LT; / assemblyBinding＆GT;
  ＆LT; /运行＆GT;
  ＆LT;的EntityFramework＆GT;
    ＆LT; defaultConnectionFactory TYPE =System.Data.Entity.Infrastructure.SqlConnectionFactory，的EntityFramework/＆GT;
    ＆LT;！ - ＆LT;供应商＆GT;
      ＆LT;供应商invariantName =System.Data.SqlClient的TYPE =System.Data.Entity.SqlServer.SqlProviderServices，EntityFramework.SqlServer/＆GT;
    ＆所述; /提供商＆GT  - →;
  ＆LT; /的EntityFramework＆GT;
＆LT; /结构＆gt;

解决方案

这似乎是这个问题，我们也有。我们有很多的自我托管服务。如果一段时间（约1分钟）服务没有收到请求时，它变得空闲，而下一个电话实在是太慢了。

所以，原因和解决办法<一href="https://social.msdn.microsoft.com/Forums/vstudio/en-US/2dc57a71-6708-4a38-b7a9-8230fdd5675f/why-is-a-wcf-services-responce-slow-after-being-idle-for-more-than-15-seconds?forum=wcf"相对=nofollow>这里描述

我也印证了这一办法修补的情况下帮助。

从那里引用：

  

我已经证实了我们的开发者，这是一个已知的问题。原因确实与线程池和线程超时。   一个可能的解决方法是调用ThreadPool.UnsafeQueueNativeOverlapped方法在很短的时间间隔，以保持线程可用。

 类节目
{
    静态无效的主要（字串[] args）
    {
        使用（VAR主机=新的ServiceHost（typeof运算（服务1）））
        {
            ThreadPool.QueueUserWorkItem（
                新WaitCallback（委托
            {
                而（真）
                {
                    Thread.sleep代码（TimeSpan.FromSeconds（100））;
                    QueueDummyIOCPWork（）;
                }
            }））;

            host.Open（）;
            Console.WriteLine（服务运行...）;
            Console.ReadKey（假）;
        }
    }

    私有静态不安全无效QueueDummyIOCPWork（）
    {
        重叠OVL =新的重叠（）;
        NativeOverlapped * pOvl = NULL;
        pOvl = ovl.Pack（（A，B，C）=＆GT; {Overlapped.Unpack（pOvl）; Overlapped.Free（pOvl）;}，NULL）;
        ThreadPool.UnsafeQueueNativeOverlapped（pOvl）;
    }
}

I have a WCF service hosted inside a Windows Service. (SO its not hosted in IIS, it is selfhosted)

The application makes it possible to receive measurements through HTTP. These are currently being written to a txt file.

I also have a Task configured that runs everyday at a specific time.

The problem i have is that when i dont receive a measurement through HTTP for atleast 5 minutes the service seems to go idle.

I noticed that after 5 minutes it takes 30 seconds for the service to respond. After 30 seconds if i send measurements through http i get a fast response.

What could be the problem?

app.config

<?xml version="1.0"?>
<configuration>
  <configSections>
    <!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
    <section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false"/>
    <sectionGroup name="applicationSettings" type="System.Configuration.ApplicationSettingsGroup, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" >
      <section name="Applicatie.Properties.Settings" type="System.Configuration.ClientSettingsSection, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
    </sectionGroup>
  </configSections>
  <connectionStrings>

  </connectionStrings>
  <system.serviceModel>

    <bindings>

      <webHttpBinding>
        <binding name="LargeWeb" maxBufferSize="1500000" maxBufferPoolSize="1500000"
          maxReceivedMessageSize="2000000000" transferMode="Streamed">
          <readerQuotas maxDepth="32" maxStringContentLength="656000" maxArrayLength="656000"
            maxBytesPerRead="656000" maxNameTableCharCount="656000" />
        </binding>
      </webHttpBinding>
    </bindings>
    <services>
      <service name="Applicatie.Applicatie" behaviorConfiguration="Proxy">
        <host>
          <baseAddresses>
            <add baseAddress="http://localhost:5001/Applicatie"/>
          </baseAddresses>
        </host>
        <endpoint address="" binding="webHttpBinding" bindingConfiguration="LargeWeb" behaviorConfiguration="webBehavior" contract="Applicatie.IApplicatie"/>
      </service>
    </services>
    <behaviors>
      <endpointBehaviors>
        <behavior name="webBehavior">
          <webHttp/>
          <CorsSupport />
        </behavior>
      </endpointBehaviors>
      <serviceBehaviors>
        <behavior name="Proxy">
          <serviceMetadata httpGetEnabled="true" httpsGetEnabled="true"/>
          <serviceDebug httpHelpPageEnabled="true" includeExceptionDetailInFaults="true"/>
        </behavior>
      </serviceBehaviors>
    </behaviors>
    <extensions>
      <behaviorExtensions>
        <add name="CorsSupport" type="WebHttpCors.CorsSupportBehaviorElement, WebHttpCors, Version=2.0.0.0, Culture=neutral, PublicKeyToken=null" />
      </behaviorExtensions>
    </extensions>
  </system.serviceModel>
  <startup>
    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5"/>
  </startup>


  <runtime>
    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
      <dependentAssembly>
        <assemblyIdentity name="EntityFramework" publicKeyToken="b77a5c561934e089" culture="neutral"/>
        <bindingRedirect oldVersion="0.0.0.0-5.0.0.0" newVersion="5.0.0.0"/>
      </dependentAssembly>
    </assemblyBinding>
  </runtime>
  <entityFramework>
    <defaultConnectionFactory type="System.Data.Entity.Infrastructure.SqlConnectionFactory, EntityFramework"/>
    <!--<providers>
      <provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
    </providers>-->
  </entityFramework>
</configuration>

解决方案

It seems like the issue we also had. we have many self hosted services. If for some time (~1 min) service receives no requests it becomes idle, and next call is really slow.

So the reasons and solution described here

I also confirm this fix helped in our case.

Quote from there:

I have confirmed with our developers that this is a known issue. The cause is indeed related to ThreadPool and thread timeout. One possible workaround is call ThreadPool.UnsafeQueueNativeOverlapped method in short time interval to keep thread available.

 class Program
{
    static void Main(string[] args)
    {
        using (var host = new ServiceHost(typeof(Service1)))
        {
            ThreadPool.QueueUserWorkItem(
                new WaitCallback(delegate
            {
                while (true)
                {
                    Thread.Sleep(TimeSpan.FromSeconds(100));
                    QueueDummyIOCPWork();
                }
            }));

            host.Open();
            Console.WriteLine("Service running...");
            Console.ReadKey(false);
        }
    }

    private static unsafe void QueueDummyIOCPWork()
    {
        Overlapped ovl = new Overlapped();
        NativeOverlapped* pOvl = null;
        pOvl = ovl.Pack((a, b, c) => { Overlapped.Unpack(pOvl); Overlapped.Free(pOvl); }, null);
        ThreadPool.UnsafeQueueNativeOverlapped(pOvl);
    }
}

这篇关于托管在Windows服务C＃WCF 5分钟后进入闲置状态的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

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